Fix by Sjoerd Mullender to support symbolic links and make a backup of

.mirrorinfo.  Fix by me to call string.lstrip(filename) to cope with a
bug in strop.strip() in Python 1.4.  Additionally, I changed all print
statements that print filenames etc. to put them in backquotes so that
it will be more obvious when there's a funny character on one of them
(such as a space...).